itemFrequency: Getting Frequency/Support for Single Items

Description Usage Arguments Value Author(s) See Also Examples

Description

Provides the generic function itemFrequency and S4 methods to get the frequency/support for all single items in an objects based on itemMatrix. For example, it is used to get the single item support from an object of class transactions without mining.

Usage

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itemFrequency(x, ...)

## S4 method for signature 'itemMatrix'
itemFrequency(x, type, weighted = FALSE)

Arguments

x

an object.

...

further arguments are passed on.

type

a character string specifying if "relative" frequency/support or "absolute" frequency/support (item counts) is returned. (default: "relative").

weighted

should support be weighted by transactions weights stored as column "weight" in transactionInfo?

Value

itemFrequency returns a named numeric vector. Each element is the frequency/support of the corresponding item in object x. The items appear in the vector in the same order as in the binary matrix in x.

Author(s)

Michael Hahsler

See Also

itemFrequencyPlot, itemMatrix-class, transactions-class

Examples

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data("Adult")
itemFrequency(Adult, type = "relative")

Example output

Loading required package: Matrix

Attaching package: 'arules'

The following objects are masked from 'package:base':

    abbreviate, write

                                age=Young 
                             1.971050e-01 
                          age=Middle-aged 
                             5.051185e-01 
                               age=Senior 
                             2.608616e-01 
                                  age=Old 
                             3.691495e-02 
                    workclass=Federal-gov 
                             2.931903e-02 
                      workclass=Local-gov 
                             6.420703e-02 
                   workclass=Never-worked 
                             2.047418e-04 
                        workclass=Private 
                             6.941976e-01 
                   workclass=Self-emp-inc 
                             3.470374e-02 
               workclass=Self-emp-not-inc 
                             7.907129e-02 
                      workclass=State-gov 
                             4.055935e-02 
                    workclass=Without-pay 
                             4.299578e-04 
                      education=Preschool 
                             1.699357e-03 
                        education=1st-4th 
                             5.057123e-03 
                        education=5th-6th 
                             1.042136e-02 
                        education=7th-8th 
                             1.955284e-02 
                            education=9th 
                             1.547848e-02 
                           education=10th 
                             2.843864e-02 
                           education=11th 
                             3.709922e-02 
                           education=12th 
                             1.345154e-02 
                        education=HS-grad 
                             3.231645e-01 
                    education=Prof-school 
                             1.707547e-02 
                     education=Assoc-acdm 
                             3.277917e-02 
                      education=Assoc-voc 
                             4.219729e-02 
                   education=Some-college 
                             2.227182e-01 
                      education=Bachelors 
                             1.643053e-01 
                        education=Masters 
                             5.439990e-02 
                      education=Doctorate 
                             1.216166e-02 
                  marital-status=Divorced 
                             1.358052e-01 
         marital-status=Married-AF-spouse 
                             7.575447e-04 
        marital-status=Married-civ-spouse 
                             4.581917e-01 
     marital-status=Married-spouse-absent 
                             1.285779e-02 
             marital-status=Never-married 
                             3.299824e-01 
                 marital-status=Separated 
                             3.132550e-02 
                   marital-status=Widowed 
                             3.107981e-02 
                  occupation=Adm-clerical 
                             1.148806e-01 
                  occupation=Armed-Forces 
                             3.071127e-04 
                  occupation=Craft-repair 
                             1.251382e-01 
               occupation=Exec-managerial 
                             1.246059e-01 
               occupation=Farming-fishing 
                             3.050653e-02 
             occupation=Handlers-cleaners 
                             4.242251e-02 
             occupation=Machine-op-inspct 
                             6.187298e-02 
                 occupation=Other-service 
                             1.007944e-01 
               occupation=Priv-house-serv 
                             4.954752e-03 
                occupation=Prof-specialty 
                             1.263667e-01 
               occupation=Protective-serv 
                             2.012612e-02 
                         occupation=Sales 
                             1.126899e-01 
                  occupation=Tech-support 
                             2.960567e-02 
              occupation=Transport-moving 
                             4.821670e-02 
                     relationship=Husband 
                             4.036690e-01 
               relationship=Not-in-family 
                             2.576266e-01 
              relationship=Other-relative 
                             3.083412e-02 
                   relationship=Own-child 
                             1.552148e-01 
                   relationship=Unmarried 
                             1.049302e-01 
                        relationship=Wife 
                             4.772532e-02 
                  race=Amer-Indian-Eskimo 
                             9.622866e-03 
                  race=Asian-Pac-Islander 
                             3.110028e-02 
                               race=Black 
                             9.592154e-02 
                               race=Other 
                             8.312518e-03 
                               race=White 
                             8.550428e-01 
                               sex=Female 
                             3.315180e-01 
                                 sex=Male 
                             6.684820e-01 
                        capital-gain=None 
                             9.173867e-01 
                         capital-gain=Low 
                             4.801196e-02 
                        capital-gain=High 
                             3.460137e-02 
                        capital-loss=None 
                             9.532779e-01 
                         capital-loss=Low 
                             2.387290e-02 
                        capital-loss=High 
                             2.284919e-02 
                 hours-per-week=Part-time 
                             1.210638e-01 
                 hours-per-week=Full-time 
                             5.850907e-01 
                 hours-per-week=Over-time 
                             2.595307e-01 
                hours-per-week=Workaholic 
                             3.431473e-02 
                  native-country=Cambodia 
                             5.732771e-04 
                    native-country=Canada 
                             3.726301e-03 
                     native-country=China 
                             2.497850e-03 
                  native-country=Columbia 
                             1.740305e-03 
                      native-country=Cuba 
                             2.825437e-03 
        native-country=Dominican-Republic 
                             2.108841e-03 
                   native-country=Ecuador 
                             9.213382e-04 
               native-country=El-Salvador 
                             3.173498e-03 
                   native-country=England 
                             2.600221e-03 
                    native-country=France 
                             7.780189e-04 
                   native-country=Germany 
                             4.217682e-03 
                    native-country=Greece 
                             1.003235e-03 
                 native-country=Guatemala 
                             1.801728e-03 
                     native-country=Haiti 
                             1.535564e-03 
        native-country=Holand-Netherlands 
                             2.047418e-05 
                  native-country=Honduras 
                             4.094836e-04 
                      native-country=Hong 
                             6.142255e-04 
                   native-country=Hungary 
                             3.890095e-04 
                     native-country=India 
                             3.091601e-03 
                      native-country=Iran 
                             1.207977e-03 
                   native-country=Ireland 
                             7.575447e-04 
                     native-country=Italy 
                             2.149789e-03 
                   native-country=Jamaica 
                             2.170263e-03 
                     native-country=Japan 
                             1.883625e-03 
                      native-country=Laos 
                             4.709062e-04 
                    native-country=Mexico 
                             1.947095e-02 
                 native-country=Nicaragua 
                             1.003235e-03 
native-country=Outlying-US(Guam-USVI-etc) 
                             4.709062e-04 
                      native-country=Peru 
                             9.418124e-04 
               native-country=Philippines 
                             6.039884e-03 
                    native-country=Poland 
                             1.781254e-03 
                  native-country=Portugal 
                             1.371770e-03 
               native-country=Puerto-Rico 
                             3.767249e-03 
                  native-country=Scotland 
                             4.299578e-04 
                     native-country=South 
                             2.354531e-03 
                    native-country=Taiwan 
                             1.330822e-03 
                  native-country=Thailand 
                             6.142255e-04 
           native-country=Trinadad&Tobago 
                             5.528029e-04 
             native-country=United-States 
                             8.974243e-01 
                   native-country=Vietnam 
                             1.760780e-03 
                native-country=Yugoslavia 
                             4.709062e-04 
                             income=small 
                             5.061218e-01 
                             income=large 
                             1.605381e-01 

arules documentation built on May 29, 2017, 3:27 p.m.

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